Improve geofencing: throttle location updates with distance to fence.

Previously any geofence (proximity alert) would turn the GPS on at full rate.
Now, we modify the GPS interval with the distance to the nearest geofence.
A speed of 100m/s is assumed to calculate the next GPS update.

Also
o Major refactor of geofencing code, to make it easier to continue to improve.
o Discard proximity alerts when an app is removed.
o Misc cleanup of nearby code. There are other upcoming changes
  that make this a good time for some house-keeping.

TODO:
The new geofencing heuristics are much better than before, but still
relatively naive. The next steps could be:
- Improve boundary detection
- Improve update thottling for large geofences
- Consider velocity when throttling

Change-Id: Ie6e23d2cb2b931eba5d2a2fc759543bb96e2f7d0

1 files changed, 10 insertions, 1 deletions

diff --git a/location/java/com/android/internal/location/DummyLocationProvider.java b/location/java/com/android/internal/location/DummyLocationProvider.java
index e7b5143..3122960 100644
--- a/location/java/com/android/internal/location/DummyLocationProvider.java
+++ b/location/java/com/android/internal/location/DummyLocationProvider.java
@@ -24,7 +24,7 @@ import android.location.LocationProvider;
  * A DummyLocationProvider may be queried to determine the properties
  * of the provider whcih it shadows, but does not actually provide location
  * data.
- * 
+ *
  * {@hide}
  */
 public class DummyLocationProvider extends LocationProvider {
@@ -86,6 +86,7 @@ public class DummyLocationProvider extends LocationProvider {
      * Returns true if the provider requires access to a
      * data network (e.g., the Internet), false otherwise.
      */
+    @Override
     public boolean requiresNetwork() {
         return mRequiresNetwork;
     }
@@ -95,6 +96,7 @@ public class DummyLocationProvider extends LocationProvider {
      * satellite-based positioning system (e.g., GPS), false
      * otherwise.
      */
+    @Override
     public boolean requiresSatellite() {
         return mRequiresSatellite;
     }
@@ -104,6 +106,7 @@ public class DummyLocationProvider extends LocationProvider {
      * cellular network (e.g., to make use of cell tower IDs), false
      * otherwise.
      */
+    @Override
     public boolean requiresCell() {
         return mRequiresCell;
     }
@@ -113,6 +116,7 @@ public class DummyLocationProvider extends LocationProvider {
      * monetary charge to the user, false if use is free.  It is up to
      * each provider to give accurate information.
      */
+    @Override
     public boolean hasMonetaryCost() {
         return mHasMonetaryCost;
     }
@@ -123,6 +127,7 @@ public class DummyLocationProvider extends LocationProvider {
      * under most circumstances but may occassionally not report it
      * should return true.
      */
+    @Override
     public boolean supportsAltitude() {
         return mSupportsAltitude;
     }
@@ -133,6 +138,7 @@ public class DummyLocationProvider extends LocationProvider {
      * under most circumstances but may occassionally not report it
      * should return true.
      */
+    @Override
     public boolean supportsSpeed() {
         return mSupportsSpeed;
     }
@@ -143,6 +149,7 @@ public class DummyLocationProvider extends LocationProvider {
      * under most circumstances but may occassionally not report it
      * should return true.
      */
+    @Override
     public boolean supportsBearing() {
         return mSupportsBearing;
     }
@@ -153,6 +160,7 @@ public class DummyLocationProvider extends LocationProvider {
      * @return the power requirement for this provider, as one of the
      * constants Criteria.POWER_REQUIREMENT_*.
      */
+    @Override
     public int getPowerRequirement() {
         return mPowerRequirement;
     }
@@ -164,6 +172,7 @@ public class DummyLocationProvider extends LocationProvider {
      * @return the horizontal accuracy for this provider, as one of the
      * constants Criteria.ACCURACY_*.
      */
+    @Override
     public int getAccuracy() {
         return mAccuracy;
     }